Fiends are an essential part of Best Fiends.
As you progress in the game and get closer to Mt. Boom, you will find more Fiends to join your team.
You can find nearly all normal Fiends by opening the cages with Keys at the end of each level. You will earn free keys when you pass levels. You can also purchase extra keys with Diamonds to increase your chances of finding Fiends sooner.
You can check whether there are Fiends or Exclusive Fiend Styles to find in the cages by tapping the ‘i’ button just above the cages.
You’ll be taken to a screen that will tell you if there is something available for you to find.
You will not find Fiends in specific levels; they start appearing in the game by chance as you enter new worlds (Green Glades, Frozen Hills, Endless Desert, Ominous Ocean, etc...) Finding them will require some patience, a bit of a sixth sense, and a dash of luck, too! Of course, the more keys you have, the better your chances to find new Fiends.
Question: I am at level 90 and my friend is at level 70. She has found Bob the Ladybug already but I could not, is something wrong? Answer: It is possible and nothing is wrong. It seems your friend was a bit more lucky than you and simply found Bob the Ladybug sooner than you did. As you progress, you too will eventually find Bob by using keys to open more cages!